1. Which of the following represents a function?
   

x -2 -1 0 -1 -2

y 2 3 4 5 6


x 1 1 0 2 2

y 1 2 3 4 5


x 1 2 3 4 5

y 2 2 3 3 4


x 1 1 1 1 1

y 2 3 4 5 6

1. What is the domain of the function: {(2, 1); (4, 2); (6, 3); (8, 4)}?
   

{1, 2, 3, 4}

{1, 2, 3, 4, 6, 8}

{2, 4, 6, 8}

{6, 8}

1. What is the range of the function: {(2, 1); (4, 2); (6, 3); (8, 4)}?
   

{1, 2, 3, 4}

{1, 2, 3, 4, 6, 8}

{2, 4, 6, 8}

{6, 8}

1. Suppose p varies directly with d, and p = 7 when d = 3. What is the value of d when p = 28?
   

4/3

12

16

140/3

1. Given the function T(z) = 7 − z, find T(−4).
   

−11

11

−3

3

1. What is the equation of the graph?
   
   

f(x) = − |x| + 2

f(x) = − |x| − 2

f(x) = − |x + 2|

f(x) = − |x − 2|

1. The number of calories burned, C, varies directly with the time spent exercising, t. When Dennis walks for 4 hours, he burns 800 calories. Which of the following equations shows this direct linear variation?
   

C = t

C = 800t

C = 4t

C = 200t